A straight forward job unless the sensor is seized in its hole. I think the S70 is like the 850. There should be two, one in the exhaust pipe just before the cat converter and one in the pipe just behind the CC. Hopefully one of these guys will correct me if I'm wrong. They resemble large spark plugs with four wires. Get Bosch sensors ( not aftermarket generic ones) and make certain they are correct for your engine. You can get two types, a "direct fit" and a "universal" with the latter being cheaper but will require you to cut and splice the wires with a splice kit which is straight forward. See Bay 13 for pics and step by step instructions of the procedure.
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